What Causes Vaginal Discharge And Stomach Cramps?

Okay me and my boyfriend had sex about 2 weeks ago. We used a spermicidal condom and he even pulled out. For about the past 4 days I have been having period like cramps and kind of a lot of discharge. I don't get my period until the 16th-17th. Am I pregnant or am I ovulating? I'm so worried!! Please help!